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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Morphology-Function Relationship of ZnO: Polar Planes, Oxygen Vacancies, and Activity
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Morphology-Function Relationship of ZnO: Polar Planes, Oxygen Vacancies, and Activity

机译：ZnO的形态功能关系：极面，氧空位和活性

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摘要

The relationship between morphology and function of ZnO is demonstrated by investigating its polar planes, oxygen vacancies, and catalytic activity for N-formylation. ZnO with various morphologies is controllably synthesized via simple hydrothermal reactions. Scanning electron microcopy images exhibit a variety of the as-prepared hexagonal zinc oxides: rods, disks, rings, and screw caps as a new member of ZnO morphology family. Each of the morphologies is remarkably different from the others in the proportion of the (0001) and (0001) polar planes in the outside surfaces of ZnO crystals. The analysis of photoluminescence spectra shows that there exist more oxygen vacancies in the samples with large polar planes. The synthesized samples are used as a catalyst for the N-formylation of aniline and show a morphology-dependent activity: ZnO with large polar planes is more catalytically active for the N-formylation reaction. This is attributed to the fact that the polar planes generate easily oxygen vacancies, which are considered as the favored sites for catalyzing the N-formylation reaction. The results suggest a positive relationship among polar planes, oxygen vacancies, and catalytic activity for N-formylation.
机译：ZnO的形态与功能之间的关系通过研究其极性平面，氧空位和对N-甲酰化的催化活性来证明。通过简单的水热反应可控制地合成各种形态的ZnO。扫描电子显微镜图像显示出各种制备的六边形氧化锌：作为ZnO形态族的新成员的杆，盘，环和螺帽。每种形态在ZnO晶体的外表面中的（0001）和（0001）极平面的比例上都彼此明显不同。对光致发光光谱的分析表明，在具有大极性平面的样品中存在更多的氧空位。合成的样品用作苯胺N-甲酰化的催化剂，并显示出形态学相关的活性：具有大极性平面的ZnO对N-甲酰化反应更具催化活性。这归因于以下事实：极平面容易产生氧空位，其被认为是催化N-甲酰化反应的有利位点。结果表明极面，氧空位和N甲酰化的催化活性之间呈正相关。

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